Oppositions and deadly conflicts among ethnic collectives are importan
t around the world. Ethnies (our term for ethnic groups) also strongly
affect interstate relations. Both interethnic and ethnic-state confli
cts tend to be severe, protracted, and intractable. At the extremes, t
he stakes are total: survival versus genocide. Competition and rivalry
for individualized economic and political goods are important, but th
e most intense conflicts are to be expected when the stakes are collec
tive goods, including categorical claims to prestige and political aut
hority. States are major actors in creating, accentuating, or diminish
ing ethnic identities. States are both arenas of rivalry and conflict
and resources for ethnic mobilization and counter-mobilization. Becaus
e both ethnies and states are diverse, careful specification is requir
ed for fruitful analysis. The same dictum applies for the diverse type
s of oppositions and of conflicts. Ethnic conflicts arise from complex
combinations of ethnic strength, class, inequality, political opportu
nity, mobilization resources, interdependence, and international inter
ventions. Frequent but nonviolent protests, for example, are most like
ly by organized collectivities with substantial resources, operating i
n relatively open political systems. International aid to parties in d
omestic conflicts appears to prolong and intensify ethnic struggles. R
esearch in this field contends with many difficulties, and one-sided t
heories do not fare well. Yet abundant descriptive materials are avail
able, statistical techniques are improving, conceptual clarification c
ontinues, and substantive knowledge does accumulate. Accordingly, ther
e is hope for better understanding of some of the most destructive and
tragic conflicts of our times.